It would be very nice if we had the option to create a Hell Mode / Hard Core Mode Master Account (a side from our normal Master Account), with some specific configuration as always 1x/1x/1x, Death = Delete and limitations on Trades and Parties.
Today we kinda lack this kind of challenge in the game, so would be a very attractive gameplay for those whose already reached end-game.
As for a "prize" for reaching the 260/55 as a Hard Mode and some milestones, we could get like Costumes (bound) and Muh Coins / Consumables (bound), so the player would feel it was worth it and yet not break the game market or even "force" a player do be a hardcore player to have a stunning reward.
What you guys think? Me and my friends are playing our own Hardcore rules, and its being very fun, however, not that challenging still haha.